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The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study

Bengaluru, May 16: At least 23 new COVID-19 positive cases have emerged in the past 19 hours, raising Karnataka''s tally to 1,079, a health official said on Saturday.

"New cases reported from Friday 5 p.m. to Saturday noon are 23," said the official.

Among the 1,079 cases, 548 are active and isolated in designated hospitals across the state, 494 patients got discharged and 36 died of the virus.

In the past 19 hours, cases spiked in Benglaluru Urban, the place hosting the highest number of coronavirus cases in the state.

Of the new cases, Bengaluru Urban reported 14 cases, followed by 3 in Hassan and Mandya, Ballari, Bagalkote, Davangere, Dharwad and Udupi, 1 each.

All the 14 cases, men, from Bengaluru Urban were secondary contacts of positive case 653.

All Hassan, Dharwad and Bagalkote cases had a history of inter-state travel to Mumbai, Maharashtra, India''s largest sufferer of Covid.

A 46-year-old man from Ballari had a travel history to Ahmedabad in Gujarat, another major COVID-19 hotspot state in India.

A 40-year-old man from Mandya had inter-district travel history to Kolar and Bengaluru.

A 1-year-old infant girl from Udupi had international travel history to Dubai.

Among the new cases, 15 are contacts of earlier cases.

Of the all cases, 20 are men and three women.

Only four of the 23 cases are above 50 and 18 below 40.

Of the 1,079 cases, 12 per cent patients were senior citizens, 66 per cent men and 34 per cent women with a discharge rate of 44 per cent.

Mangaluru, Jun 25: Teacher-turned-serial rapist-cum-killer Cyanide Mohan Kumar was sentenced to life imprisonment in the 20th and final case by Sixth Additional District and Sessions Judge Sayeedunnisa on Wednesday.

Cyanide Mohan Kumar (57) was declared guilty in the 20th rape and murder case on Saturday and the judge had pronounced the order before a small group of advocates in the court hall. Cyanide Mohan who appeared in the court hall via video conferencing facility from Hindalga central jail in Belagavi did not show any emotions.

The 25-year-old victim from Kasaragod was working as a cook in a hostel and met Mohan, serving as a teacher in 2009. He had met her at her home on many occasions and had promised to marry her.

On July 8, 2009, she left home on the pretext of visiting a temple in Sullia and

did not return. When her family tried to reach her on phone, Cyanide Mohan had told they were married and would return home soon.

Mohan took her to a toilet in a bus stand in Bengaluru on July 15, 2009, and had left with her jewels after ascertaining that she had died by consuming Cyanide. No sooner Mohan was arrested in October 2009, the family of the victim had recognised him from the newspapers. The police also recovered the victim’s jewellery from the house of Mohan’s second wife.

Sixth Additional District and Session Court convicted Mohan under sections of IPC 302 for murder with life sentence and Rs 25,000 fine, IPC 366 for kidnapping with ten years of rigorous imprisonment and Rs 5000 fine, IPC 376 for rape with seven years of rigorous imprisonment and Rs 5000 fine, IPC 328 for poisoning with ten years of imprisonment, IPC 394 for causing hurt while robbing with 10 years of imprisonment and Rs 5000 fine, IPC 392 for theft with five years of imprisonment, IPC 201 for destroying evidence with seven years of rigorous imprisonment and Rs 5000 fine, IPC 417 cheating and one year of imprisonment.